Thinning-operations
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Pseudohylesinus grandis
Pseudohylesinus grandis is a bark beetle (Curculionidae, formerly Scolytidae) associated with western hemlock forests of coastal North America. It completes one generation annually with two broods and four larval instars, overwintering as a teneral adult. The species exhibits distinct breeding habitat preferences, utilizing fresh slash in thinned stands rather than stumps. Adult females engage in pre-oviposition feeding on the inner bark of standing live host trees before constructing egg galleries in slash material.